Mineral Information and Data:

Manganhumite
Mn2+7(SiO4)3(OH)2 [CNMNC approved formula]

Named for manganese in the composition and relation to humite.

IMA status : Approved Species 1978 ()
CLASSIFICATION 
Dana
(8th edition) :
52.03.02c.03  
  (52) Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.03) with cations in [6] coordination only
  (52.03.02c) Humite group (Humite series)
  
Nickel-Strunz
(10th edition) :
09.AF.50
  (09) Silicates
  (09.A) Nesosilicates (Isolated tetrahedron) structures
  (09.AF) Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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